rejuvenate

Concise Oxford English Dictionary © 2008 Oxford University Press:
rejuvenate /rɪˈdʒuːvəneɪt/

▶verb

• 1 make or cause to appear younger or more vital.

• 2 (often as adj. rejuvenated) restore (a river or stream) to a condition characteristic of a younger landscape.

– derivatives
rejuvenation noun,
rejuvenator noun.

– origin C19: from re- + L. juvenis ‘young’ + -ate3.